Here...let me give it a try......responding to this hypothetical statement made by a guy just fresh out of kindergarten "
it is ok to smoke while working on the fuel system"
Hi.....Gasoline can light up your smoke BIG TIME 
See
Dangers of smoking around fuel tanks
So....
how can I help you with your fuel system issues 
It is a much more difficult position to suggest you disagree with someone else (or lecture them) vice just state your position.
In this example.....lets leave it to the viewers to determine who has the better position or if in fact there is a disagreement regarding smoking around fuel tanks....
I just presented some facts and no need for me to debate any further.....I do not need to say the individual is wrong, or
try every trick in the book not to offend the guy from kindergarten as
I did not evaluate his understanding....
just presented my understanding.
If the individual responds wanting to debate.....I will just say OK......and move on to questions from High School Graduates
I would NOT say this in any post response....but this is my general philosophy 
You cannot fix stupid.
I can explain it to you but I cannot understand it for you.
I am being tested 